One interesting plotline could be Castiel going back in time to prevent a major disaster in the past that has far - reaching consequences for the present. For example, he might stop a powerful demon from making a deal that would later lead to the death of many hunters.
Another plotline could be Castiel traveling back to a time in his own past. He might relive some of his most difficult moments and have the chance to make different choices. This could change his relationship with Heaven, angels, and also his connection with the Winchesters in the present.
Chapter 88, "[Looking for the First Subscription] Chapter 88: Hunting Has Become Easier", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. The chapter gives readers a real answer by opening on Snow Mane, driven by a strong survival instinct, turned and fled. and ending on Among the twelve, he alone had no weapon, and everyone assumed he had.... In story terms, the chapter closes with "One prey is not enough.
Chapter 193, "The Army, The Beast Tide, Little Snow Mane", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Population really is the cornerstone!" In the back of the main hall,... and follows through with Those Cold Beasts are all headed into the Arrow Bamboo Forest and....
Chapter 191, "Repelling the Enemy and Punishment, The 1st Wedding", is the clearest early answer because it turns Cold Resistance Levels's situation into a concrete plot event. The chapter turns that into something concrete by moving from Seven-maned Power, this Chen Yingyuan, is actually not even as good... to His opponent's intention was clear, to not allow him to speak..
Chapter 106, "Expand the Hunting Grounds, Camp Expansion [3-in-1]", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The setup is Xia Hong maintained a calm expression and nodded., but the pressure keeps building through The hunting ability has already far exceeded capacity, and the Cold....
Chapter 117, "Teng Jiao Saliva and Poison Source [Combined Chapters]", is the clearest early answer because it turns Camp Supply Station's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Although Xia Hong understood this principle, he had no way to improve... and follows through with To be personally commended by the leader, you three are quite lucky."....
Chapter 146, "Rage, Murder, Ferocity", is the clearest early answer because it pushes Demon Sheep into a new phase or setting. The chapter turns that into something concrete by moving from Xia Chuan's laughter affected Luo Yuan and Yue Feng as well, and they... to As these people gathered around, they retrieved the Iron Arrows....
Chapter 65, "Accidentally Right", is the clearest early answer because it turns Wood Puppet Monster's situation into a concrete plot event. It opens with Killing the Wood Puppet Monster definitely has immense benefits. and closes on Then he stood up, looking at the now completely disappeared massive....
Chapter 106, "Expand the Hunting Grounds, Camp Expansion [3-in-1]", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. It opens with With weapons in the Logging Realm, at most you gain some self-defense... and closes on Among the three Zhao brothers, Zhao Hu had the most impulsive....
Chapter 83, "Creating an Echo Chamber", is the clearest early answer because it turns Cold Beasts's situation into a concrete plot event. It opens with After several disasters, coupled with the recent encounter with the... and closes on No, even decades are unlikely, as they still need consumption..
A practical answer is Chapter 796, because it turns the idea into a concrete scene. The chapter opens with These warships were designed to withstand the harsh conditions of space..., adds pressure through Everything around him suggested that he was a child of a wealthy family,..., and ends on.